Effect

Rollout inflicts damage over five turns, doubling in power for each consecutive hit. The power will reset after five turns or if Rollout is interrupted. The power of Rollout is also doubled if Defense Curl has been used previously by the Pokémon and the user has remained in battle since then.

Red and Blue Rescue Teams

Rollout attacks 5 times in a single turn, with damage increasing by 50% of the first hit for each successive hit. The move ends once all 5 attacks are done or if the move misses, whichever occurs first.

Explorers of Time, Darkness, and Sky

Rollout works the same way, except that the damage is increased by 10% per successive hit.

Trivia

Lickitung, which evolves into Lickilicky when leveled up knowing this move, has been able to learn it in some way since the move's introduction. This trait is shared with AncientPower, which has had a similar history with Piloswine.

If a Pokémon levels up mid-battle and a new move is learned in place of Rollout while it is still being used, the Pokémon will continue using Rollout in spite of having forgotten it.

A level 100 Shuckle can potentially deal the most damage in one single attack through the use of numerous stat boosters; by using Helping Hand by an ally, holding a Metronome, Power Trick, a Skill Swap to Pure Power, and 6 Attack boosts. Also, Shuckle's partner must have the Ability Flower Gift and the weather must be sunny. On the 5th turn of using Rollout consecutively without any misses, if used against a level 1 Ledyba, Yanma or Combee with minimum Defense stats, that have been hit with negative Defense modifiers (such as Screech), it can deal 48,121,381 damage with a critical hit.

The base power of Rollout is 480 on the fifth turn, the highest base power of any move as of Generation V. In earlier generations, the power of Explosion was effectively 500, though Generation V changed it by no longer halving Defense.